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G. F. BAILEY.

' RECEIVING TELEPHONE.

No. 268,630. Patented Dec. 5, 1882.

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- ATTORNEYS.

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NITED STATES PATENT OFFICE.

GEORGE F. DAILEY, OF LEADVILLE, COLORADO.

RECEIVING-TELEPHONE.

SPECIFICATION formiirg part of Letters Patent No. 268,630, dated December 5, i882,:

Application filed March 13, 1882.

To all whom it may concern Be it known that I, GEORGE E. DAILEY, of Leadville, in the county of Lake and State of Colorado, have invented certain new and useful Improvements in Receiving-Telephones, of which the following is a full, clear, and exact description.

My invention has for its object to increase the efficiency of receiving-telephones. This I effect by the construction and combination of parts,hereinaiter described, whereby the entire volume of' sound on one side of the diaphragm is delivered into one ear and the entire volume of sound on the other side thereof is delivered into the other ear.

In accompanying drawings, Figure 1 is a longitudinal section of my improved double receiving-telephone. one end of the magnet employed in said telephone.

The bobbin A, having conducting-wires L attached, is placed on a tubular soft-iron core, 0, which is tapped into one end of a magnet, 1), also passes through the casing E, and is screwed into one of the rigid receiving or soundconducting tubes H. The other conductingtube H is attached to a short tube, H, which is aligned with the tubular core 0 and passes through the opposite side of the casing E. Between the core 0 and tube His placed the diaphragm F.

The outer ends of the tubes H are shown curved upward and inward, and provided with mouth-pieces J, which are arranged opposite and facing each other and at suiiicient dis" tance apart to bring them into the required proximity to the respective right and left ears when the instrument is properly adjusted for the purpose of receivinga message. The said Fig. 2 is a plan view of (No model.)

tube H, being rigid, will always retain the form and relation shown in the drawings.

The instrumentis used with a battery'transmitter-for instance, Blakes or Edisons. The inner ends of the tubes H H terminating, practically, directly opposite the middle point of 45 the diaphragm F, where the amplitude of vibration is greatest, conduct to both ears the entire volume of sound produced on both sides of the diaphragm-that is to say, one tube H conducts to one ear and the other tube to the other ear the entire volume of sound produced on its side of the diaphragm. Thus the entire sound is utilized, so that a message that might be indistinct or faintly audible with the ordinary form of single tube-receiver becomes clear and loud when received through my improved instrument.

I am aware that telephones have. been prothe ear-pieces J J, placed facing each other,

all as shown and described, for the purpose specified.

GEORGE FAY DAILEY. Witnesses:

G. G. WHITE, WV. 0. BROWN. 

